[ Tubes ]

AET Japan, Inc.
AMT Incorporation
ATI-Advanced Technology, Inc.
Hi-Technology Trading, Inc.
Midoriya Electric Co., Ltd.
NEC Microwave Tube, Ltd.
New Japan Radio Co., Ltd.
PTM Corp.
Sogo Electronics, Inc.



Advanced Electronics Technology Associates, Inc. [AET Japan, Inc.]
California Tube Laboratory, Inc. [AET Japan, Inc.]
HeatWave Labs, Inc. [AET Japan, Inc.]
Keltec, A Crane Co. Company [Astech Corp.]
L-3 Communications, Electron Devices [Midoriya Electric Co., Ltd.]
Vertex Microwave Products, Inc. [Hi-Technology Trading, Inc.]